Shadow Volley

Petra Kvitova of the Czech Republic returns the ball to Maria Sharapova of Russia during their women's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris.

Petra Kvitova of the Czech Republic returns the ball to Maria Sharapova of Russia during their women's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris. (REUTERS/Benoit Tessier)

Petra Kvitova of the Czech Republic returns the ball to Maria Sharapova of Russia during their women's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris.REUTERS/Benoit Tessier